Expanding arbor



Sept. 11, 1%23.

Filed June 4, 1920 WE z 4 L: B T U M g /4 M 4M U 5 Mi 7 m M 7 w w 9 n JATTORNEY thereon.

always centered and secured in Patented ent. ill, 11923.

, teaser rice.

- Application filed tune it, reap. Serial 130.386.4183.

The-arbor consists of a solid tapered spindle To all whom it mayconcern:

Be it known that I, WALLAGE W. Tums, a citizen of the United States,residing at Detroit, county of Wayne, State of Michian, have invented acertain new and useful improvement in Expanding Arbors, and declare thefollowing to be a full, clear, and

exact description of the same, such as will enable others skilled in theart to which it pertains to make and use the same, reference being hadto the accompanying drawings, which form a part of this specification.

This invention relates to expanding arbors, and the ob'ect of theinvention is to providean expan ing arbor having a solid one-piecespindle which may be secured head and tail stocks either between, or thetapered end may be inserted in the spindle of a machine and which isprovided with an expanding member which, by operation of a lever, ma beexpanded to secure the work is device is for use in releasably holding apiece of work, the work of whatever character being provided with acentral aperture adapted to be slipped over the expanding member,whereby the art cle is accurately centered and secured relative to thecenter of rotation. When the operation is com leted the expanding memberis contracts and the material removed at which time another piece may bepositioned thereon and the arbor expanded. In this manner the necessityof securing each piece of work separately in a chuck and centerin ittherein is avoided, the expanding or or being osition. Thus a greatsaving of time is e ected, it being only necessary to move the lever tocontract or expand the arbor when securing each piece thereon and theactual work on the material may be almost continuous. These objects andthe several novel features of the invention are hereinafter more fullydescribed and claimed and the preferred form of construction by whichthese objects are attained is shown in the accompanying drawings inwhich Fig. 1 is a plan view of an expanding arbor embodying myinvention.

F Fig. 2 is a section taken on line 2-2 of Fig. 3 is an enlarged sectiontaken on line 3-3 of Fig. 1.

Fig. 4 is a section similar to Fig. 2 showing the position assumed bythe parts before the work is secured thereon.

1 which'is ta cred from th e'l ne 2 to the extreme end t ereof and thespindle is pro vided with a longitudinal slot 3 therethrough in which ismounted a pair of levers 4 and 5 pivoted on the pin 6 between the sidesof t said slot is a bar 7 notched at each end 3 and 9 to receive theedges of the annular member 10 which is provided with a tapered face11,- the member 7 bein secured to the member 10 at each end. About thespindle between the end ofthe slot 3 and the end 12 of the spindle is anannular sprin member 13, which as will be seen from iigs. 1 and 3, isprovided with alternate slots 14 cut in from the opposite ends thereofand each ending in an enlarged aperture 15. The member 13 is rovidedwith taperin internal faces 16 an 17 at each end thereo the tapered face11 of the member 10 fitting the tapered face 17 in the member 13 and thetapered end 18 of the spindle fitting the ta ered face 16 of the member13. Pivots at 19 is a lever 20 apertured at 20 on opposite sides toreceive pins on each of the two half rings 20 and 20 fitting the groovedannular member 23 positioned about the spindle and adapted to takenormally the position shown in Fig. 4. This member 23 is provided withan internal tapered face 24 which is adapted to engage the ends of thelevers 4 and 5.

In operation the article to be operated on, which is to be understood ashaving a central aperture, is placed over the expanding 1e slots 3. Alsopositioned in the member 13 of the device, the parts of the device beingpositioned as shown in Fig. 4 at this time. When the article has beenplaced on the expanding member 13, the

operator, by movement of the lever 20 on the pivot 19, moves the member23 to the positionshown in Fig. 2, the tapered face 24 thereof engagingthe ends of the levers 4 and 5 and brin ing them together, which actionforces the ar 7 and the tapered annular member 10 forward into the endof the member 13, expanding the member 13 as shown in Fig. 2 b causingthe ends of the member 13 to ride outwardly on the tapered face 11 ofthe annular member 10. Due to this operation and expansion of the member13 the inner periphery of the material at the central aperture thereof.is tightly engaged by the member 13 thereby holding the same tightly onthe central spindle. When the member 23 is moved back to the positionshown in Fig. 4 the inherent tendency of the spring member 13 tocontract forces the annular member 10 to the position shown which forcesthe ends of the levers 4 and 5 outwardly in which position the work maybe removed from the spring member 13 and a new iece placed thereon. Inuse the tapered portion 1 of the spindle may be used to replace the livecenter of a head stock and, in cases where extreme pressure is appliedto the work on the expanding end of the spindle, a tail stock may beused having a center fitting the aperture 25 in the said spindle endthereby solidly and accurately supporting the material to be worked.

From the foregoing description it becomes evident that the device, whilesimple in construction is very efficient in operation, of comparativecheapness of manufacture, accomplishes the objects desired and providesan expanding arbor having a. solidspindle of great strength andwhich-will not easily get-out of order. By the means for and methoddescribed of expandin the sleeve uniformly throughout its lengt it isevident that work supported thereon may be finished accuratelyconcentric with the aperture through which the sleeve is posiitioned.

Having thus briefly described my invention, its utility and mode ofoperation, what I claim and desire to secure by Letters Patent of theUnited States is 1. In an arbor, a solid spindle provided with a slot, apair of levers pivotally mounted therein, an annular member having atapered peripheral face, a bar secured to the said annular member andextending through the slot, a shifting member about the spindle adjacentthe slot'having an internal ta ered face adapted to engage the ends of te levers, an annular spring member engaging over the end of the spindle,the extreme end of the spindle being enlarged and provided with atapered face, the spring member havin a companion tapered face, and alever w ereby the shiftmg member may be moved to actuate the levers andex and the spring member.

2. ln an ar r, a solid one-piece spindle, the extreme end thereof beingprovided with a tapered face, an annular sprin r member .provided withtapered faces at eac end thereof, one of said faces being adapted to fitthe tapered face on the spindle, an annular member having a tapered faceadapted to fit the tapered face at the opposite end of the springmember, said spindle being provided with a slot, a bar fitting in theslot being secured at each end to the said annular member, a pair oflevers engaging the said bar and; means for moving the ends of the saidlevers together to expand the annular spring member.

3. In an arbor,.a solid one piece spindle having a tapered end for aheadstock, the

opposite end thereof being provided with a I conical face, an annularspring. member having longitudinal slots extending thereinto from eachend alternately to beyond the center and having a tapered face at eachend, a cone-shaped member slidably mounted on the spindle and fitting anend of the spring member, said spindle having a slot, a pivoted lever inthe slot, and means whereby movement of the lever in one direction movesthe 'slidable coned member to expand the spring member.

'-In testimony whereof, I sign this specification.

WALLACE W. TUTTLE.

